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U4=(4^2+5/2*4)-(3^2+5/2*3)
U4=(16+10)-(9+7,5)
U4=36-16,5
U4=19,5
U3=S3-S2
U3=(3^2+5/2*3)-(2^2+5/2*2)
U3=(9+7,5)-(4+5)
U3=16,5-9
U3=7,5
beda = 19,5-7,5
= 12
kemarin aku ngerjain kayak gitu, mungkin ada kesalahan dalam pengerjaan. hehe